Finding the Fourth Proportional to 112.31, 155.01 and 65.06

Step by Step Solution

1. Step 1: Write the proportion equation
   112.31 : 155.01 = 65.06 : x
2. Step 2: Convert to fraction form
   112.31/155.01 = 65.06/x
3. Step 3: Cross multiply
   112.31x = 155.01 × 65.06
4. Step 4: Simplify right side
   112.31x = 10,084.95
5. Step 5: Solve for x
   x = 10,084.95/112.31
6. Step 6: Final answer
   x = 89.80